Fix .vue import issue within TS components

[cnotv]

Description

Prevent the use of imports with .vue extension.

Context

In an initial investigation, this issue was not appeared during the development, although it does in this case.

To reproduce

Create a new component and import other non TS components, e.g.:

import CruResource from '@shell/components/CruResource';

<script lang="ts">
export default Vue.extend({
  components: {
    CruResource
  },
})
</ script>

Issue can be solved exclusively by adding extension:

import CruResource from '@shell/components/CruResource.vue';

[gaktive]

@cnotv to review what's going here and update the ticket.

[nwmac]

Needs some discussion